摘要
为研究折线配筋先张预应力混凝土梁在疲劳荷载下的性能,设计制作2根跨度为7.5 m的折线先张梁,对其在不同上限和下限弯矩作用下进行疲劳受力性能和疲劳试验后的终静载试验。试验结果表明:整个试验过程中,混凝土应变仍基本符合平截面假定,剩余承载力不受加载历史影响,承载力和裂缝宽度仍可按GB 50010—2010《混凝土结构设计规范》推荐的算式计算,抗疲劳性能良好。对梁顶混凝土压应变、钢绞线、非预应力钢筋疲劳应力幅和疲劳应力比随荷载循环次数变化规律的算式进行拟合。
To research the fatigue behavior of the prestressed concrete beams with pretensioned bent-up tendons, 2 prestressed concrete beams （ span = 7.5 m） with pretensioned bent-up tendons were designed and made, and the fatigue behavior test and the last statical test after their fatigue behavior test were carried out under different upper- limit and lower-limit bending moment. It was proved by the experimental resuh that the concrete strain basically agreed with the plane cross-section assumption in the whole experimental process, the residual bearing capacity was not affected by the loading history, the hearing capacity and the crack width still could be calculated by the formulas stipulated in the code, and the fatigue behavior of the beam was excellent. The formulas where compressive strain of the beam top, strand, the fatigue stress amplitude of nonprestressed reinforcement and fatigue stress ratio were changed with the loading cycles were fitted, and it can be referenced for developing numerical analysis software of the behavior of the prestressed concrete beams with pretensioned bent-up tendons and the fatigue behavior analysis in the engineering application.
出处
《工业建筑》
CSCD
北大核心
2015年第7期95-101,共7页
Industrial Construction
基金
国家自然科学基金项目(50578148)
河南省交通厅资助项目(2005P338)
关键词
折线先张梁
预应力混凝土
疲劳性能
应力
应变
裂缝
刚度
pretensioned bent-up tendons beam
prestressed concrete
fatigue behavior
stress
strain
crack
stiffness
